/// <inheritdoc/>
public override IType Decode(LNode data, DecoderState state)
{
if (data.Calls(pointerSymbol))
{
if (!FeedbackHelpers.AssertArgCount(data, 2, state.Log))
{
return(ErrorType.Instance);
}
var elemType = state.DecodeType(data.Args[0]);
PointerKind kind;
if (AssertDecodePointerKind(data.Args[1], state, out kind))
{
return(elemType.MakePointerType(kind));
}
else
{
return(ErrorType.Instance);
}
}
else if (data.Calls(genericParameterSymbol))
{
if (!FeedbackHelpers.AssertArgCount(data, 2, state.Log))
{
return(ErrorType.Instance);
}
IGenericMember parent;
SimpleName name;
if (state.AssertDecodeGenericMember(data.Args[0], out parent) &&
state.AssertDecodeSimpleName(data.Args[1], out name))
{
var types = state.TypeResolver.ResolveGenericParameters(parent, name);
if (AssertSingleChildType(types, data, state, "generic declaration"))
{
return(types[0]);
}
}
return(ErrorType.Instance);
}
else if (data.Calls(CodeSymbols.Of))
{
if (!FeedbackHelpers.AssertMinArgCount(data, 2, state.Log))
{
return(ErrorType.Instance);
}
var genericDecl = state.DecodeType(data.Args[0]);
var genericArgs = data.Args.Slice(1).EagerSelect <LNode, IType>(state.DecodeType);
int count = genericDecl.GenericParameters.Count;
if (count != genericArgs.Count)
{
FeedbackHelpers.LogSyntaxError(
state.Log,
data,
FeedbackHelpers.QuoteEven(
"type ",
FeedbackHelpers.Print(data.Args[0]),
" is instantiated with ",
genericArgs.Count.ToString(),
" arguments but has only ",
count.ToString(),
" parameters."));
return(ErrorType.Instance);
}
return(genericDecl.MakeGenericType(genericArgs));
}
else if (data.Calls(CodeSymbols.Dot))
{
if (!FeedbackHelpers.AssertArgCount(data, 2, state.Log))
{
return(ErrorType.Instance);
}
SimpleName childName;
if (!state.AssertDecodeSimpleName(data.Args[1], out childName))
{
return(ErrorType.Instance);
}
var parentType = state.DecodeType(data.Args[0]);
if (parentType == ErrorType.Instance)
{
// Make sure that we don't log an additional error
// just because the parent type was wrong.
return(ErrorType.Instance);
}
var childTypes = state.TypeResolver.ResolveNestedTypes(parentType, childName);
if (AssertSingleChildType(childTypes, data, state, "type"))
{
return(childTypes[0]);
}
else
{
return(ErrorType.Instance);
}
}
else
{
QualifiedName fullName;
if (state.AssertDecodeQualifiedName(data, out fullName))
{
var types = state.TypeResolver.ResolveTypes(fullName);
if (AssertSingleGlobalType(types, data, state))
{
return(types[0]);
}
else
{
return(ErrorType.Instance);
}
}
else
{
return(ErrorType.Instance);
}
}
}
